Valve



N. I. KONWJKL Feb. 2, 1954 VALVE Filed Oct. 18, 19.50

fzzz Ez-zfur NICK I KONWAL a a a w A w MW i {I r 9 G l.v .7 z W, 3

Patented Fe'b. 2, 1954 VALVELJ NickI. Konwal, Cicero, Ill'.-,. assignon to. Cyrus,

Shank Company, Chica of Illinois go, Ill,, a corporation,

Application October 18, 1950, Serial-Nm 190,838?

' 2 Claims.

Thisinvention relates in general to a valve construotion and is more: particularly concerned with the type of valvehavingaforward. seating valve and a back seating valve.

The valve of this invention provides a novel arrangement in aback seating valve structure wherein a back seat retaining member is formed initially of aring having an outer straight cylindrical wall. The. ringismade of suitable material and is. positioned in the bore of the body of the valve. For holding; or securing the retaining ring. in the bore of the bodyof the valve permanently, the ring is outwardly swaged into a preformed. annular groove in the bore by a suitable toolsuch as-aspreading tool or punch having a tapered. end portion.

It isto be noted that the back seat retaining member does not threadably engage thebody of the valve, but 'is secured in-place in a preformed groovetherein. This provides a valve structure that is economical and easy to manufacture without. sacrificing durability and sturdiness, The back seating valve member. and the retaining member are permanently secured to. the body member so as to. provide an improved sealing'arrangement; Further, such an arrangement provides a back seating valvemember that: is not readily loosened by excessive vibrations.-

Accordingly, an object of theupresent invention is to provide avalve structurehaving aforward: seating valve and a back seating valve wherein the back seat is held in :place in the bore of the bodyof the valve by a retaining member that has been outwardly deformed to fit into an annular groove preformed: in the. wall of the bore.

Another object? ofithe present invention is to provide an economical method of making a back seating valve assembly;

Another. object of the present invention is to provide a back seating valve structure which is strong," sturdy and durable, which is economical and easyto manufacture, which is efficient and leak-proof.

Another object of the present invention is to provide a back seating valve structurethat has animproved sealing arrangement. characterized by, the-use of a back valve seat retainer that is permanently secured to the body member.

Another object of the present invention is to provide-a back seating valve structure in which theback valve seat. cannot. be; readily loosened by excessive vibrations.

Other objects and advantages of the invention will become apparent from the following bodying the present invention;

' Figurez. is a vertical sectional view of the valve embodying. the. present invention;

Figure 3' is an. enlargedifragmentary sectional viewparticularly illustrating. the ring forming. the: retaining member. for" the-back. seat. as= it appearsinitially; and I V Figure 4:18 an enlarged fragmentary sectional view ofrthe valve shown in Figure 2 andzparticue larlyillustrating the retaining;- ring; outwardly: swaged into an. annular groove of the -bore oflthe bodyof. the valve-to secure-the back: seat; of the valve.

As shown .on the -drawings:.

The valve of my invention comprises'avalve body [0; of suitable, material having, a stepped cylindrical axial-boretherethrough; the lower; end of. which is counterbored, as'atl3-andrprovided with:threads.- l2=to constitute-aninlet H forconnection in a p pe, line. A; smoothboreportion Maori-decreased diameter extends inwardly-oh the counterbore, l3; with an. inclined shoulder: I 5, therebetween.

A forward valve seat is provided by an annular inclined. shouldeiv I Byformedr at: the junctiombetweerr the. bore. portion l4 and an adjoining 0ylindrical. bore portion l-L of. increased; diameter; The upper. portion of the; bore I 'l is-threaded, .as at. 18; At. the upper end: of the threaded s portion I8 an increased. diameter: bore l9 provides; a plane .annular rearwardlyfacing-shoulder: 20.3 An annular groove 39 is-formed in: the-bore; lib-have ing. an: outwardly tapered portion: forming; an. annular forwardly facingshoulder 40 for. a puri pose that willlater. appear.

The valve body In is also formed twith ailateral discharge or: outlet.- 21 having. a counterbore 23 threaded as at .24 and comrm nicating-v with; the bore portion l J through a. reduced rdiameter pas sage 22 The: upper portion: 25. of; thevalve: body L is externally: threaded. for receiving; an internally threaded cap 211. Axcentralaperture 28 isaprovided in thecap- 2,1: for: freely passing a. valve stem 28.- I

Theevalvestemi 9.:is acy-lindricalrod-extending throughtthebore portions; l '1 and l SiofrthesvalVe body It! and haaanaintegraleenlargement iiill ter minatingratitszzlowerend in aifrusto -conical por tion forming a forward valve 3|. The largest diameter of the valve 3| i larger than the diameter of the bore portion 14, but smaller than the diameter of the bore portion l1, thereby serving as a forward valve for seating against the seat IS. A similar frusto-conical portion at the upper end of the enlargement 39 provides a back valve 32.

An intermediate portion of the integral enlargement 39 is threaded, as at 33, for engagement with internal threads [8 of the bore 11 to move the stem axially when its handle 36 is turned.

Packing 34 is held in position about the upper .portion of the stem 29 by a smooth-surfaced packing gland 35 surrounding the stem 29 and freely slidable in the upper portion of the bore 19. By screwing the cap 21 down tightly against the upper end of the packing gland 35 the packing 34 is maintained under compression, sealing the upper end of the bore.

In accordance to one embodiment of my invention, a retaining ring 31 or back valve seat member having an inside diameter greater than that of the stem 29 is positioned against the annular shoulder to provide a back seat for the back valve 32. Initially, the retaining ring 31 is of generally cylindrical shape, as shown in Figure 3. For permanently securing the retaining ring 37 in place against the rearwardly facing shoulder 20, the upper portion of periphery of the retaining ring 31 is outwardly swaged into the annular groove 39 by means of a suitable tool, such as a spreading tool or a punch 59 provided with a tapered end portion 51. The annular groove 39 has an outwardly tapered portion adjacent the forwardly facing shoulder 49. Thereupon, the back valve seat assumes the shape shown in Figure 4.

When permanently secured in the valve body ID, the back valve seat retaining member 31 has a generally cylindrical lower end portion 31a filling the bore portion [9 and seated on the annular rearwardly facing shoulder 29. An upper peripheral flange portion 31b of the ring 31 is deformed outwardly into the preformed groove 39 of the valve body II] to insure permanent securement thereto. The inner surface 310 of the valve seat retaining member 31 is generally cupshaped.

In another embodiment of the present invention, a back valve seat assembly is provided having a back seat member 38 which is positioned above the threaded portion 18, against the lower end of the retaining ring 31. Initially, the seat member 38 is formed of a ring having an outer straight cylindrical wall 38a and an inner straight cylindrical wall 38b, as shown in Figure 3. The outer wall 38a has a diameter equal to the root diameter of the threaded portion 18 and the inner wall has a diameter of appropriate size for receiving the valve stem 29.

The back seat member 39 is secured in position by seating the retaining ring 31 on the rearwardly facing shoulder 29 in abutting contact with the seat 38 and outwardly swaging the upper peripheral portion of the retaining ring 31 into the groove 39, in a manner previously described.

After the back seat member 38 is secured in place by the back seat retaining ring 31, the valve stem 29 is raised to deform the inner wall 38b. The frusto-conical portion 32 of the valve stem 29 deforms the inner wall 391) to provide an inclined inner wall 380, as shown in Fig. 4, conforming to the contour of the frusto-conical end portion 32, thereby forming the seat for the back seatin valve 32. r

The back valve seat thus provided is permanently secured to the body member, thereby providing a seat that is not readily loosened by excessive vibrations. Further, it is to be noted that the valve structure may be manufactured economically.

It will be understood that modifications and variations may be effected without departing from the scope of the novel concepts of the present invention.

I claim as my invention:

1. In a valve structure having a forward seating and back seating valve, a body having a cylindrical bore provided with a rearwardly facing shoulder, and an annular groove forming a forwardly facing annular shoulder, an annular back valve seat comprising aring in abutting contact with said forwardly facing shoulder and having a rearward groove abutting edge and an outer periphery extending radially outwardly into said groove to permanently retain said ring against said rearwardly facing shoulder and an inner periphery which is tapered to provide a packing compression surface, and a stem movable in said bore and having a valve for seating against the forward edge of said back valve seat to prevent movement of fluid through said bore past said back valve seat when said forward seating valve is in a wide open position. 7

2. In a valve of the type having a forward seating valve and a back seating valve, a body member having a bore therein, the wall of said here providing a forward valve seat shoulder, a forwardly facing back shoulder formed by the rear edge of an annular groove in said bore, a back seat member in said bore, a back seat retaining member having a forward edge providing an abutment for said back seat member and having a peripheral flange projecting outwardly into said groove so that the rear edge of said retaining member abuts said forwardly facing back shoulder thereby permanently retaining said back seat member in position, and a stem extending through said bore, back seat member and retaining member and having first and second frusto conical portions for seating respectively on said forward shoulder to provide a forward seating valve and on said back seat member to provide a back seating valve, the inner surface of the said projecting flange forming a tapered recess between the stem and said retaining member for receiving valve packing material about the stem and causing the packing material to tightly grip the stem.

NICK I. KONWAL.

References Cited in the file of this patent UNITED STATES PATENTS FOREXGN PATENTS Country Date Sweden of 1934 Number Number 

